For me the best locations are off center by one or two seats, second to fourth rows from front (only second to third rows in a small room), never on a wall, and never under an air vent.

I show up to classes that first day early and try out the different seats until I find one visually comfortable. I too am short, but thankfully few people like sitting in the first row so the second row works out.

Go to your professor and ask if it would be OK if you could sit in front of the class while giving your presentation. Let her know you are having problems with standing and speaking simultaneously. Be detailed in how it causes you a problem.